diff --git a/lib/vquic/curl_quiche.c b/lib/vquic/curl_quiche.c
index 298439a247..bbb069096e 100644
--- a/lib/vquic/curl_quiche.c
+++ b/lib/vquic/curl_quiche.c
@@ -747,10 +747,20 @@ static CURLcode cf_flush_egress(struct Curl_cfilter *cf,
   struct cf_quiche_ctx *ctx = cf->ctx;
   ssize_t nread;
   CURLcode result;
+  int64_t expiry_ns;
   int64_t timeout_ns;
   struct read_ctx readx;
   size_t pkt_count, gsolen;
 
+  expiry_ns = quiche_conn_timeout_as_nanos(ctx->qconn);
+  if(!expiry_ns) {
+    quiche_conn_on_timeout(ctx->qconn);
+    if(quiche_conn_is_closed(ctx->qconn)) {
+      failf(data, "quiche_conn_on_timeout closed the connection");
+      return CURLE_SEND_ERROR;
+    }
+  }
+
   result = vquic_flush(cf, data, &ctx->q);
   if(result) {
     if(result == CURLE_AGAIN) {